Liver stew

I got a recipy of liver stew i, and all who appreciate calf liver find delicuous.

It has main ingrediants liver, calf stock, salvia, white pepper, garlic, onions,apple. a bit of flour some assorted veggies etc. but it comes out a gray boring color, how can i make this dish more presentable? I have added a bit of bell peppers or such to give it a clash of color but i am looking for something more.